Teleport : Minions are immune but turrets no longer are?

When I first began playing, when you TP'd to a turret, it would become immune from a certain amount of damage that would execute it during the duration of the teleport. The same applied to minions.

However, nowadays when I play, this immunity only applies to minions & no longer turrets, which ruins for me a lot of teleport-based plays around objectives.

Is this intentional? If so, why was this change made? It really upsets me as a top laner & makes me feel a lot more useless than I already do in objective control.